dma-mapping: introduce DMA range map, supplanting dma_pfn_offset
The new field 'dma_range_map' in struct device is used to facilitate the
use of single or multiple offsets between mapping regions of cpu addrs and
dma addrs. It subsumes the role of "dev->dma_pfn_offset" which was only
capable of holding a single uniform offset and had no region bounds
checking.
The function of_dma_get_range() has been modified so that it takes a single
argument -- the device node -- and returns a map, NULL, or an error code.
The map is an array that holds the information regarding the DMA regions.
Each range entry contains the address offset, the cpu_start address, the
dma_start address, and the size of the region.
of_dma_configure() is the typical manner to set range offsets but there are
a number of ad hoc assignments to "dev->dma_pfn_offset" in the kernel
driver code. These cases now invoke the function
dma_direct_set_offset(dev, cpu_addr, dma_addr, size).
Signed-off-by: Jim Quinlan <james.quinlan@broadcom.com>
[hch: various interface cleanups]
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Tested-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Tested-by: Nathan Chancellor <natechancellor@gmail.com>
diff --git a/drivers/of/unittest.c b/drivers/of/unittest.c
index 9b7e84b..06cc988 100644
--- a/drivers/of/unittest.c
+++ b/drivers/of/unittest.c
@@ -7,6 +7,7 @@
#include <linux/memblock.h>
#include <linux/clk.h>
+#include <linux/dma-direct.h> /* to test phys_to_dma/dma_to_phys */
#include <linux/err.h>
#include <linux/errno.h>
#include <linux/hashtable.h>
@@ -869,10 +870,11 @@ static void __init of_unittest_changeset(void)
}
static void __init of_unittest_dma_ranges_one(const char *path,
- u64 expect_dma_addr, u64 expect_paddr, u64 expect_size)
+ u64 expect_dma_addr, u64 expect_paddr)
{
+#ifdef CONFIG_HAS_DMA
struct device_node *np;
- u64 dma_addr, paddr, size;
+ const struct bus_dma_region *map = NULL;
int rc;
np = of_find_node_by_path(path);
@@ -881,28 +883,40 @@ static void __init of_unittest_dma_ranges_one(const char *path,
return;
}
- rc = of_dma_get_range(np, &dma_addr, &paddr, &size);
+ rc = of_dma_get_range(np, &map);
unittest(!rc, "of_dma_get_range failed on node %pOF rc=%i\n", np, rc);
+
if (!rc) {
- unittest(size == expect_size,
- "of_dma_get_range wrong size on node %pOF size=%llx\n", np, size);
+ phys_addr_t paddr;
+ dma_addr_t dma_addr;
+ struct device dev_bogus;
+
+ dev_bogus.dma_range_map = map;
+ paddr = dma_to_phys(&dev_bogus, expect_dma_addr);
+ dma_addr = phys_to_dma(&dev_bogus, expect_paddr);
+
unittest(paddr == expect_paddr,
- "of_dma_get_range wrong phys addr (%llx) on node %pOF", paddr, np);
+ "of_dma_get_range: wrong phys addr %pap (expecting %llx) on node %pOF\n",
+ &paddr, expect_paddr, np);
unittest(dma_addr == expect_dma_addr,
- "of_dma_get_range wrong DMA addr (%llx) on node %pOF", dma_addr, np);
+ "of_dma_get_range: wrong DMA addr %pad (expecting %llx) on node %pOF\n",
+ &dma_addr, expect_dma_addr, np);
+
+ kfree(map);
}
of_node_put(np);
+#endif
}
static void __init of_unittest_parse_dma_ranges(void)
{
of_unittest_dma_ranges_one("/testcase-data/address-tests/device@70000000",
- 0x0, 0x20000000, 0x40000000);
+ 0x0, 0x20000000);
of_unittest_dma_ranges_one("/testcase-data/address-tests/bus@80000000/device@1000",
- 0x100000000, 0x20000000, 0x2000000000);
+ 0x100000000, 0x20000000);
of_unittest_dma_ranges_one("/testcase-data/address-tests/pci@90000000",
- 0x80000000, 0x20000000, 0x10000000);
+ 0x80000000, 0x20000000);
}
static void __init of_unittest_pci_dma_ranges(void)